You will need a realy strong computer to play it smoothly ;) Note: You MUST have a 3D accelerator wich supports Pixel-Shader. If you have problems starting it, try to start it with "+set r_ext_framebuffer_object 0"...

Excessive dawn (edawn) is a free Quake 3 Arena mod, with numerous improvements, both client and server side. Biggest feature is the fact you can tweak almost every single aspect of the game, from weapon behavior to making your own mini gametypes.

Q3F is a class-based game, based on the original TF for Quake, allowing you to play the role of one of ten character classes. Classes include the Recon, Sniper, Soldier, Grenadier, Paramedic, Flame-Trooper, Mini-Gunner, Agent, Engineer and Civilian.

EntityPlus is a Quake III Arena mod that is aimed at expanding the toolset for Quake III Arena map makers. The goal is to build an expansive library of new entities that map makers can use in their maps to create whole new experiences.